LTC1878 データシートの表示（PDF） - Linear Technology
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LTC1878 Datasheet PDF : 16 Pages
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LTC1878
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 3.6V unless otherwise specified.
SYMBOL PARAMETER
IPK
ILSW
VSYNC/MODE
ISYNC/MODE
VRUN
IRUN
Peak Inductor Current
SW Leakage
SYNC/MODE Threshold
SYNC/MODE Leakage Current
RUN Threshold
RUN Input Current
CONDITIONS
VIN = 3.3V, VFB = 0.7V, Duty Cycle < 35%
VRUN = 0V, VSW = 0V or 6V, VIN = 6V
VSYNC/MODE Rising
VRUN Rising
MIN TYP MAX
0.8
1.0
1.25
±0.01 ±1
q 0.3
1.0
1.5
±0.01 ±1
q 0.3
0.7
1.5
±0.01 ±1
UNITS
A
µA
V
µA
V
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1878E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the – 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1878EMS8: TJ = TA + (PD)(150°C/W)
Note 4: The LTC1878 is tested in a feedback loop which servos VFB to the
balance point for the error amplifier (VITH = 1.2V).
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Input Voltage
100
95
ILOAD = 100mA ILOAD = 10mA
90
85
ILOAD = 300mA
ILOAD = 1mA
80
ILOAD = 0.1mA
75
70
Burst Mode OPERATION
65 VOUT = 2.5V
L = 10µH
60
2
3
4
5
6
INPUT VOLTAGE (V)
78
1878 G01
Efficiency vs Output Current
100
90 VIN = 3.6V
80
VIN = 4.2V
70
60
VIN = 3.6V
50
40
VIN = 4.2V
30
20
10
0
0.1
PULSE SKIPPING MODE
Burst Mode OPERATION
VOUT = 1.8V
L = 10µH
1
10
100
OUTPUT CURRENT (mA)
1000
1878 G02
Efficiency vs Output Current
95
90 L = 15µH
85
L = 10µH
80
75
70
65
60
Burst Mode OPERATION
55 VIN = 6V
50 VOUT = 2.5V
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
1878 G03
3
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